void i2c_recvevent(uint8_t *buf, int8_t size);
void i2c_recvbyteevent(uint8_t hwstatus, uint8_t i, uint8_t c);
void i2c_sendevent(int8_t size);
void i2c_recvevent(uint8_t *buf, int8_t size);
void i2c_recvbyteevent(uint8_t hwstatus, uint8_t i, uint8_t c);
void i2c_sendevent(int8_t size);